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REAL ESTATE INVESTMENTS - Summary of Property Dispositions (Details) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2022 USD ($) | Apr. 14, 2022 USD ($) a | Jan. 20, 2022 USD ($) a | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 28, 2022 a | Jun. 28, 2022 ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net gain on disposition of real estate |  |  |  | $ 144 | $ 68 | $ 144 | $ 142 |  |
Net gain on sale of undepreciated real estate |  |  |  | $ 4,127 | $ 0 | 5,024 | $ 1,993 |  |
Land | Gateway G & H |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | a |  |  | 10.0 |  |  |  |  |  |
Sales Price |  |  | $ 1,600 |  |  |  |  |  |
Net gain on disposition of real estate |  |  | $ 897 |  |  |  |  |  |
Land | 25 M Street |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | a |  | 0.8 |  |  |  |  |  |  |
Sales Price |  | $ 29,675 |  |  |  |  |  |  |
Net gain on disposition of real estate |  | $ 3,436 |  |  |  |  |  |  |
Land | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net gain on disposition of real estate | $ 700 |  |  |  |  |  |  |  |
Office/Land | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres |  |  |  |  |  |  |  | 4.0 | 42,809
Sales Price | 4,100 |  |  |  |  |  |  |  |
Net gain on disposition of real estate | $ 831 |  |  |  |  |  |  |  |
Office properties | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net gain on disposition of real estate |  |  |  |  |  | $ 100 |  |  |

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